<!-- Expected value is JSON -->
<textarea id="source0">
	<p><img src="http://example-picture.com/random.png" /></p>
	=>
	[
		"http://example-picture.com/random.png"
	]
</textarea>
<textarea id="source1">
	<p><img class="border" width="400" height="300" data-custom="something" src="http://example-picture.com/random.png?parameter=2" /></p>
	=>
[
	"http://example-picture.com/random.png?parameter=2"
]
</textarea>
<textarea id="source2">
	<p><img src="file:///Some/Path/To/Local/Resources/kitty.jpeg" class="invisible" /></p>
	=>
	[
		"file:///Some/Path/To/Local/Resources/kitty.jpeg"
	]
</textarea>
<textarea id="source3">
	<p><img class="one" src="//example.com/pic1.png" /></p><p>Hello world</p><p><img src="//example.com/pic2.gif" class="two" /></p><div><span class="something"><img src="" /></span></div>
	=>
	[
		"//example.com/pic1.png",
		"//example.com/pic2.gif",
		""
	]
</textarea>
<textarea id="source4">
	<p>There is no img</p>
	=>
	[]
</textarea>
